Wrong place to ask.... however, if your looking to play a 3.0 game, you should be able to use on of the 3.5 charactersheets just fine still... there are a few major changes between 3.0 and 3.5 but none of them should make a significant differenct when it comes to the charactersheet. Most of the changes are just differences in mechancics of certain actions, and rulings on how certain things interact... none of which impact how the charactersheets work. If you are looking to play 3.5 however, then you will want to look into accuiring a 3.5 handbook. Roll20 is not the place to discuss the mechanics of rule systems. But I hope this information will help.